The storyline of the sci-fi film 400 Days is about unusual social experiment. Four people are subjected to simulated deep cosmos travel. The goal of the experiment is to explore the psychological effect of relations between people in confined space for 400 Days. They have no communication with outer world; see no sun, just projected visual effects. Each of them has to bank only on himself and his experiment partners. But one day team realizes that something goes wrong. This is not they signed for. Now they are not aware of what is real and what is not. What they see is all part of simulation. Or is it not? And what should they do now?